[KEYCLOAK-9004] Update Node.js versions in Travis config
[KEYCLOAK-9004] Update Node.js versions in Travis config

keycloak/keycloak-nodejs-connect,keycloak/keycloak-nodejs-connect,abstractj/keycloak-nodejs-connect,keycloak/keycloak-nodejs-connect,abstractj/keycloak-nodejs-connect,abstractj/keycloak-nodejs-connect